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I didn't want overhead wires and all that mess, but I am glad you asked because I did think about my answer, should someone ask . . . 

 

It's a Gyrobus:  Oerlikon developed them in the 1940s.  It it electric powered byt stores energy in a spinning flywheel that  is "re-charged" during stops at each end of the trolley line.  They were used in Switzerland for a while and I always thought it was a very nifty idea that should be tried again now that flywheel technology has developed much farther with carbon fiber, etc.

 

http://en.wikipedia.org/wiki/Gyrobus

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